Apparatus for forming sand molds



.J. J. KINZER, Jr. APPARATUS FOR FORMING, SAND MOLDS.

(No Model.)

Patented Aug. 4,1891.

A i/ yms sas:

UNITED STATES PATENT OFFICE.

JOHN J. KINZER, JR., OF PITTSBURG, PENNSYLVANIA APPARATUS FOR FORMINGSAND MOLDS.

SPECIFICATION forming part of Letters Patent No. 457,321, dated August4, 1891. Application filed April 10, 1891. Serial No. 388,389- (Nomodel.)

To all whom it may concern.-

Be it known that I, JOHN J. KINZER, J r., a citizen of the UnitedStates, residing at Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inApparatus for Forming Sand Molds; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it pertains to make anduse the same, reference being had to the accompanying drawings, whichform a part of this specification.

My invention relates to an improved apparatus for forming molds; and itconsists in the peculiar construction and arrangementof parts, as willbe fully set forth hereinafter.

In the accompanying drawings, Figure 1 is a side elevation, partly insection, of a series of molding apparatus which are constructed inaccordance with my invention. Fig. 2 is a section elevation of the gageor measuring box, showing the trap-doors or valve,partly open. Fig. 3 isan external elevation of the same. Fig. 1 is a sectional elevation ofone of the finished molds.

To construct a molding apparatus in accordance with my invention, Iplace a large trough 1 above a series of molding-benches 2 and arrangetherein a suitable sand-conveying device 8, capable of receiving thesand from another conveyer 4 and carrying the same to the opposite endof the trough 1, and then back along the bottom of the same anddischarging the sand into measuring or gage boxes 5, located at regularintervals beneath the conveyer 3. The surplus sand is carried back anddischarged into a chute 6, leading from the trough 1 to the bin or pointfrom which the same was taken. These measuringboxes 5 are arranged atthe mouth of a series of vertical chutes or guides '7, which extenddownward to a point a short distance above the molding-benches 2.Arranged at the base of these measuring-boxes 5 are trap-doors 8, hingedto the same in a manner that when the said doors are down anuninterrupted or free passage will be formed for the sand in itsdownward descent into the guides 7. To operate these doors 8, I attachthe same to two short links 9, which are pivoted to a rod 10, whichextends downward and is'connected to a hand-lever 11 and the said doorsheld locked by a latch 12. This rod 10 is formed in two pieces and thesame hinged together, so that the lower portion may oscillate tocorrespond with the movement of the lever 11.

In operation the sand is conveyed into the measuring-boxes 5, as abovedescribed, and the surplus removed. The mold-flasks 13 are arranged onthe benches 2 and the patterns 14: placed therein in a manner Well-knownto the art. The hand-lever 11 is released from the latch 12 and the samegiven a quick upward movement, which will open the doors 8 and permitthe sand contained therein to drop in a body into the flask 13, therebypacking the same evenly throughout the entire mold. If it is desired toform larger molds, the measuring-boxes 5 may be removed and boxes of agreater length put in their place. The advantages of this method ofmolding are many, and among which are that the sand is evenly andgradually placed into the measuring-boxes, thereby insuring the exactquantity of sand necessary to form the mold, and when the same in itsdescent through the guide enters the mold it will run to all parts ofthe same and pack with sufficient density to require no ramming or otherpressure to complete the mold. This apparatus will be found particularlyuseful when castings of a regular and even size are to be formed, suchas pipe-slugs for welding wrought-iron tubing, and many other castingswhere the greatest degree of exactness is required, which could not beobtained if the sand is not measured and dropped from a given heightinto the mold and allowed to pack itself by its own weight or gravity.

Having thus described my invention, I claim-- 1. The combination, in asand molding apparatus, of gage-boxes, trap-doors hinged therein,vertical chutes extending from said gage-boxes to a point adjacent tothe mold ing-ben-ches, links each secured at one end to one of saidtrap-doors, a rod connecting the adjacent ends of each pair of links, asshown, and means for operating said rod to open and close saidtrap-doors.

2. The combination, in a sand molding apparatus, with a trough, asand-conveying device therein, means for elevating the sand into the topof said trough onto the conveying means therein, and means for carryingoff the surplus sand, of gage-boxes having communication with theinterior of said trough, trap doors hinged therein, vertical chuteshaving their lower ends adjacent to the molding-benches,1inks eachsecured at one end to one of said trap-doors, a rod connecting theadjacent ends of each pair of links, as shown, and means for operatingsaid rods to open and close said trap-doors.

3. The combination, in a sand molding apparatus, of gage-boxes,trap-doors hinged therein, vertical chutes having their lower endsadjacent to the molding-benches, links In testimony that I claim, theforegoing I hereunto affix my signature this 25th day of March, A. D.1891.

JNO. J. KINZER, .13.

In presence of- CHARLES LARGE, M. E. HARRISON.

